Wind farm structure for super-wide format printing

Abstract

The utility model relates to a kind of wind field structure for super large format printing, the wind field structure includes: main air duct, one end of the main air duct is connected with the first blow port of forming cavity, the other end is connected with first suction port, for by the first blow port to the bottom of forming cavity blows gas;Make-up air duct, one end of the make-up air duct is connected with the second blow port of forming cavity, the other end is connected with the first suction port, the make-up air duct is for by the second blow port to the forming cavity inside and carries out make-up air;Upper air duct, one end of the upper air duct is connected with the third blow port of forming cavity, the other end is connected with the second suction port, for to the top of forming cavity blows gas.The utility model passes through the wind field structure of three-inlet double-outlet air duct, reduces the attenuation problem of wind speed along wind direction, can also reduce equipment air demand simultaneously.

Description

Technical Field

[0001] This utility model belongs to the field of additive manufacturing technology, and in particular relates to a wind field structure for ultra-large format printing. Background Technology

[0002] In the metal 3D printing industry, after active metal powder is melted by laser at high temperature, it will produce active metal fumes and active oxides. If these metal wastes fall into the powder sintering area, they are very likely to cause powder surface defects, resulting in abnormal quality of sintered parts and damage to scrapers. Therefore, a high-performance airflow is very important.

[0003] However, in ultra-large format printing equipment, such as 1000mm x 1000mm or 1500mm x 1500mm, the reduction in air velocity along the wind direction is unavoidable, with the reduction reaching as much as 30-40%. This can cause dust and large particles near the return air vent of the cavity to be unable to be blown away, resulting in powder surface defects and abnormal workpiece quality. If the air velocity at the return air vent is increased, the total air velocity needs to be increased, which will result in a very high air velocity near the air outlet. The powder in the toner bed will then be easily blown away, leading to powder surface defects and other abnormalities, which will also result in abnormal workpiece quality.

[0004] Currently, there are two main wind farm structures in the industry:

[0005] 1) Adopting an extra-large air inlet, i.e., a wind wall structure, increases the overall air volume of the wind field and compensates for the problem of wind speed attenuation. However, this will put a very large load on the fan, resulting in problems such as high equipment power, great damage, high noise, and unstable and difficult-to-control wind speed.

[0006] 2) The method of blowing air from the top on both sides and expelling air from the bottom reduces the distance along the wind direction. However, this results in the wind speed being almost zero at the center of the printing area, thus the quality of the workpiece in the center is poor. Utility Model Content

[0007] To address the problems existing in the background technology, this utility model provides a wind field structure for ultra-large format printing, which solves the problem of wind speed attenuation along the wind direction in ultra-large format wind fields and improves the uniformity of the wind field along the wind direction.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] On one hand, this utility model provides a wind field structure for ultra-large format printing, characterized in that a first air outlet, a second air outlet, and a third air outlet are provided on one side of the forming cavity, and a first air intake and a second air intake are provided on the other side; the first air outlet and the second air outlet are located at the bottom of one side of the forming cavity, the second air outlet is located above and close to the first air outlet, and the third air outlet is located at the top of one side of the forming cavity; the first air intake is opposite to the first air outlet, and the second air intake is opposite to the third air outlet; the wind field structure further includes:

[0010] The main air duct is connected at one end to the first air outlet of the molding cavity and at the other end to the first air inlet, and is used to blow air into the bottom of the molding cavity through the first air outlet.

[0011] The air supply duct has one end connected to the second air outlet of the molding cavity, and the other end returns air through the first air intake. The air supply duct is used to supply air into the molding cavity through the second air outlet.

[0012] An upper air duct, one end of which is connected to the third air outlet of the molding cavity and the other end of which is connected to the second air inlet, is used to blow air into the top of the molding cavity.

[0013] Furthermore, it also includes a downdraft fan, an updraft fan, a downdraft anemometer, and an updraft anemometer. The downdraft fan and the downdraft anemometer are installed on the main air duct, and the updraft fan and the updraft anemometer are installed on the updraft duct.

[0014] Furthermore, one end of the supplementary air duct is connected to the main air duct and indirectly connected to the first air intake through the main air duct, and the other end is connected to the second air outlet. The downdraft fan and downdraft anemometer are located upstream of the supplementary air duct.

[0015] Furthermore, the wind farm structure also includes a shut-off valve, which is installed on the make-up air duct and is used to adjust the wind speed of the make-up air duct.

[0016] Furthermore, the widths of the first, second, and third air outlets are basically the same, and the heights of the second and third air outlets are less than that of the first air outlet.

[0017] Furthermore, the height of the second air outlet is half the height of the first air outlet, and the height of the third air outlet is 50% to 100% of the height of the first air outlet.

[0018] Furthermore, the main air duct includes a main air duct inlet pipe and a multi-stage main air distribution mechanism. The main air duct inlet pipe is connected to the first air outlet through the multi-stage main air distribution mechanism. The supplementary air duct includes a supplementary air duct inlet pipe and a multi-stage supplementary air distribution mechanism. The supplementary air duct inlet pipe is connected to the second air outlet through the multi-stage supplementary air distribution mechanism. The upper air duct is connected to the third air outlet through the multi-stage upper air distribution mechanism. Each stage of the main air distribution mechanism, supplementary air distribution mechanism, and upper air distribution mechanism includes at least one air distribution duct and a perforated plate. Multiple air distribution ducts and perforated plates are sequentially and alternately connected to form multiple stages.

[0019] Furthermore, the main air duct also includes a main air duct return air pipe, multiple lower return air ducts, and a lower return air variable diameter port, which are sequentially and sealed and fixedly connected to the main air duct return air pipe, the lower return air variable diameter port, the multiple lower return air ducts, and the first air intake; the upper air duct also includes an upper air duct return air pipe, multiple upper return air ducts, and an upper return air variable diameter port, which are sequentially and sealed and fixedly connected to the upper air duct return air pipe, the upper return air variable diameter port, the multiple upper return air ducts, and the second air intake.

[0020] Furthermore, the first air outlet and the second air outlet are separated by a partition.

[0021] This utility model has the following advantages due to the adoption of the above technical solution:

[0022] (1) This utility model adopts a three-inlet double-outlet air duct structure, which includes a main air duct, a supplementary air duct and an upper air duct, and the two ends of the main air duct, the supplementary air duct and the upper air duct are respectively connected to the air outlets and air inlets on both sides of the working chamber. This reduces the problem of wind speed attenuation along the wind direction and also reduces the air volume requirement of the equipment.

[0023] (2) Multiple fans are independently controlled. The upper duct fan provides the air volume requirement of the thin upper duct and forms a closed loop circulation loop by combining the wind speed monitoring of the upper duct anemometer. The lower duct fan provides the air volume requirement of the lower main duct and the thin upper supplementary air duct and forms a closed loop circulation loop by combining the wind speed monitoring of the lower duct anemometer. This realizes the wind speed control of each duct, reduces the fluctuation of wind speed, and reduces equipment noise and other problems.

[0024] (3) The present invention is also equipped with a shut-off valve to adjust the air volume of the air supply duct, so that the air supply is controllable and the controllability of the wind speed is further improved.

[0025] (4) The second and third air outlets in this utility model are formed as thin air outlets relative to the first air outlet. The thin upper air duct is used to protect the galvanometer at the top of the molding cavity and prevent it from being contaminated. The thin size reduces the air volume requirement. The thin upper supplementary air duct is used to compensate for the lower air volume, increase the return air velocity, and reduce the lower air volume requirement. The supplementary air duct can suppress the air volume dispersion of the lower main air duct and supplement the air volume. The supplementary air duct can improve the uniformity of the X and Z directions. With the help of multi-level uniform air, it can improve the uniformity of the Y direction wind field.

[0026] (5) It includes a multi-level uniform wind structure formed by multiple uniform wind channels and perforated plates, which increases the uniformity of wind speed in the vertical wind direction. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0028] Figure 1 This is a schematic diagram of an embodiment of the wind farm structure provided by this utility model;

[0029] Figure 2 This is a schematic diagram of the wind field structure provided by this utility model;

[0030] Figure 3 This is a schematic diagram of the molding cavity structure;

[0031] Figure 4 The simulated cloud map is obtained by simulating the wind field structure provided by this utility model.

[0032] The markings in the attached diagram are as follows:

[0033] 1-Forming cavity, 2-First air outlet, 3-Second air outlet, 4-Third air outlet, 5-First air intake, 6-Second air intake, 10-Main air duct, 101-Main air duct inlet pipe, 102-First main air distribution duct, 103-Second main air distribution duct, 104-Third main air distribution duct, 105-Fourth main air distribution duct, 106, 107-Lower return air duct, 108-Lower return air reducer, 109-Lower return air duct Pipe, 110-First perforated plate, 111-Second perforated plate, 112-Third perforated plate, 113-Fourth perforated plate, 20-Main air duct, 201-Main air duct inlet pipe, 202-First and second supply air duct, 203-Second and third supply air duct, 204-Third and fourth supply air duct, 205-Fourth supply air duct, 30-Upper air duct, 301-Upper air duct inlet pipe, 302-Evaporation air duct, 303-Perforated plate. Detailed Implementation

[0034] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0035] like Figure 1 and Figure 3 As shown, this utility model provides an airflow structure for ultra-large format printing. A first air outlet 2, a second air outlet 3, and a third air outlet 4 are provided on one side of the forming cavity, and a first air intake 5 and a second air intake 6 are provided on the other side. The first air outlet 2 and the second air outlet 3 are located at the bottom of one side of the forming cavity 1, the second air outlet 2 is located above and close to the first air outlet 3, and the third air outlet 3 is located at the top of one side of the forming cavity 1. The first air intake 2 is opposite to the first air outlet 3, and the second air intake 3 is opposite to the third air outlet 4.

[0036] The wind field structure further includes a main air duct 10, a supplementary air duct 20, and an upper air duct 30. One end of the main air duct 10 is connected to the first air outlet of the molding cavity 100, and the other end is connected to the first air inlet 5, for blowing air into the bottom of the molding cavity 100 through the first air outlet 20. One end of the supplementary air duct 20 is connected to the second air outlet 3 of the molding cavity 100, and the other end returns air through the first air inlet 5. The supplementary air duct 20 is used to supplement air into the molding cavity 100 through the second air outlet 30. One end of the upper air duct 30 is connected to the third air outlet 4 of the molding cavity 100, and the other end is connected to the second air inlet 6, for blowing air into the top of the molding cavity 100.

[0037] During laser powder sintering, splatter and black smoke are generated. The main air duct 10 blows air into the forming cavity 100 through the first air outlet 2, removing most of the splatter and smoke generated above the substrate, and then sucks it away through the first air intake 5. Simultaneously, to reduce the airflow attenuation near the air intake caused by the large printing area, the supplementary air duct 20 supplements the airflow, preventing the main air duct airflow from rising at the end far from the air outlet, thus improving the uniformity of airflow along the X-direction in ultra-large format printing and enhancing print quality. The upper air duct 30 blows air into the working cavity through the third air outlet 4, preventing dust and smoke from adhering to the field lens and affecting the laser irradiation intensity, further improving print quality.

[0038] This invention includes two air intakes, specifically a first air intake 5 and a second air intake 6. The first air intake 5 is mainly used to remove the airflow blown in from the main air duct 10 and the supplementary air duct 20. The second air intake 6 is mainly used to remove the airflow located near the top of the top plate in the molding cavity 100. Compared with the prior art which only uses one air intake, this invention can avoid the interference of the airflow entering from the upper air duct 30 on the airflow below, effectively improve the uniformity of the overall airflow field, and further improve the protection of the galvanometer.

[0039] This utility model adopts a three-inlet, two-outlet air duct structure, which includes a main air duct 10, a supplementary air duct 20, and an upper air duct 30. The two ends of the main air duct 10, the supplementary air duct 20, and the upper air duct 30 are respectively connected to the corresponding air blowing ports and air suction ports on both sides of the forming cavity 100. This reduces the problem of wind speed attenuation along the wind direction. At the same time, compared with the existing method of increasing the air volume, it can also reduce the air volume requirement of the equipment.

[0040] More specifically, in this invention, the widths of the first air outlet 2, the second air outlet 3, and the third air outlet 4 are substantially the same, and the heights of the second air outlet 3 and the third air outlet 4 are less than that of the first air outlet 2. To ensure effective removal of splashes and dust, preferably, the widths of the first air outlet 2, the second air outlet, and the third air outlet 4 are 115% to 130% of the forming width.

[0041] Preferably, the height of the second air outlet 3 is half the height of the first air outlet 2, and the height of the third air outlet 4 is 50% to 100% of the height of the first air outlet 2. In this invention, the second air outlet 3 and the third air outlet are formed as thin air outlets relative to the first air outlet 2. The thin upper air duct protects the galvanometer at the top of the molding cavity from contamination, and its thin size reduces airflow requirements. The thin upper supplementary air duct 20 compensates for lower airflow, increases the return air velocity, and reduces lower airflow requirements. The supplementary air duct 20 suppresses airflow dispersion from the lower main air duct 10 and supplements airflow. The supplementary air duct 20 improves the uniformity in the X and Z directions, and, in conjunction with multi-stage uniform airflow, improves the uniformity of the Y-direction airflow. Here, the X direction refers to the direction along the wind speed, and the Y direction refers to the direction perpendicular to the X direction on the same horizontal plane. The Z direction refers to the height direction of the molding cavity.

[0042] Preferably, the center distance between the lower main air duct 10 and the make-up air duct 20 is approximately 2.5 to 5 times the height of the air outlet of the make-up air duct 20. This invention, through optimized design of the specific dimensions of the wind field structure, can further effectively improve the intensity and uniformity of the wind field.

[0043] The width of the first air intake 2 is preferably 90% to 100% of the width of the first air outlet; the height of the first air intake 2 is preferably similar to the height of the first air outlet 2.

[0044] like Figure 2 As shown, to further improve wind speed stability and reduce fluctuations, the wind field structure also includes a downwind duct fan, an upwind duct fan, a downwind duct anemometer, and an upwind duct anemometer. The downwind duct fan and downwind duct anemometer are installed on the main wind duct 10, and the upwind duct fan and upwind duct anemometer are installed on the upwind duct 30. The downwind duct anemometer is located downstream of the downwind duct fan, the upwind duct anemometer is located downstream of the upwind duct fan, and the downwind duct anemometer is located downstream of the downwind duct anemometer.

[0045] The downdraft fan serves as the power source for the main air duct 10 and the supplementary air duct 20, providing airflow to the lower level; the updraft fan serves as the power source for the updraft duct 30, providing airflow to the upper level. An independent control system for multiple fans is employed. The updraft fan provides the airflow required for the thin updraft duct 30, forming a closed-loop circulation circuit based on the anemometer readings from the updraft duct. The downdraft fan provides the airflow required for the lower main air duct 10 and the thin supplementary air duct 20, forming a closed-loop circulation circuit based on the anemometer readings from the downdraft duct. This system enables airflow control for each duct, reducing airflow fluctuations and minimizing equipment noise.

[0046] One end of the make-up air duct 20 is connected to the main air duct 10 and indirectly connected to the first air intake 5 through the main air duct 10; the other end is connected to the second air outlet 3. The downdraft fan and downdraft anemometer are located upstream of the make-up air duct 20. The wind farm structure also includes a shut-off valve, which is installed on the make-up air duct 20. The shut-off valve is used to adjust the airflow of the make-up air duct 20, making the make-up air controllable and improving the flexibility of airflow adjustment in the wind farm structure.

[0047] The main air duct includes a main air duct inlet pipe 101 and a multi-stage main air distribution mechanism. The main air duct inlet pipe 101 is connected to the first air outlet 2 through the multi-stage main air distribution mechanism. The supplementary air duct 20 includes a supplementary air duct inlet pipe 201 and a multi-stage supplementary air distribution mechanism. The supplementary air duct inlet pipe 201 is connected to the second air outlet 3 through the multi-stage supplementary air distribution mechanism. The upper air duct inlet pipe 301 is connected to the third air outlet 4 through a multi-stage upper air distribution mechanism. The main air distribution mechanism, the supplementary air distribution mechanism, and the upper air distribution mechanism each include at least one air distribution duct and a perforated plate. The air distribution duct is connected to one or both sides of the perforated plate. The perforated plate can be a porous structure, preferably a honeycomb structure.

[0048] Specifically, such as Figure 1 The multi-stage main air distribution mechanism includes a first main air distribution duct 102, a second main air distribution duct 103, a third main air distribution duct 104, and a fourth main air distribution duct 105. The multi-stage supplementary air distribution mechanism includes a first supplementary air distribution duct 202, a second supplementary air distribution duct 203, a third supplementary air distribution duct 204, and a fourth supplementary air distribution duct 205. The perforated plate includes a first perforated plate 110, a second perforated plate 111, a third perforated plate 112, and a fourth perforated plate 113.

[0049] The main air duct inlet pipe 101 is sealed to the lower end of one side of the first perforated plate 110 by a sealing gasket and screws, and the first main air distribution duct 102 is sealed and fixedly connected to the lower end of the other side of the first perforated plate 110. The main air duct inlet pipe 101, the first main air distribution duct 102, and the first perforated plate constitute the first-stage main air distribution mechanism.

[0050] The first main air distribution channel 102 is connected to the second main air distribution channel 103. The second main air distribution channel 103 and the third main air distribution channel 104 are respectively connected to the two sides of the bottom of the second mesh plate 111. The second main air distribution channel 102, the third main air distribution channel 104 and the second mesh plate 111 constitute the second-level main air distribution mechanism.

[0051] The third main air distribution channel 104 and the fourth main air distribution channel 105 are fixedly connected to the bottom of both sides of the third perforated plate 112, and the third main air distribution channel 104, the fourth main air distribution channel 105 and the third perforated plate 112 constitute the third-level main air distribution mechanism.

[0052] The fourth main air distribution duct 105 is fixedly connected to the bottom of one side of the fourth perforated plate 113, and the other side of the fourth perforated plate 113 is fixedly installed at the first air outlet 2. The fourth perforated plate 113 and the fourth main air distribution duct 105 constitute the fourth-level main air distribution mechanism.

[0053] The upper end of the supplementary air inlet pipe 201 is sealed to one side of the first perforated plate 110 by a sealing gasket and screws, and the upper end of the first supplementary air distribution duct 202 is sealed to the other side of the first perforated plate 110 by a sealing gasket and screws. The supplementary air inlet pipe 201, the first perforated plate 110 and the first supplementary air distribution duct 202 constitute the first-stage supplementary air distribution mechanism.

[0054] The first air supply and equalization duct 202 and the second air supply and equalization duct 203 are sealed and fixedly connected. The second air supply and equalization duct 203, the third air supply and equalization duct 204, and the second mesh plate 111 constitute the second-stage air supply and equalization mechanism.

[0055] The third air supply and equalization duct 204, the fourth air supply and equalization duct 205, and the third perforated plate 112 constitute the third-stage air supply and equalization mechanism, and the fourth air supply and equalization duct 205 and the fourth perforated plate 113 constitute the fourth-stage air supply and equalization mechanism. The air supply duct inlet pipe 201, the upper end of the first perforated plate 110, the first air supply and equalization duct 202, the second air supply and equalization duct 203, the second perforated plate 111, the third air supply and equalization duct 204, the third perforated plate 112, the fourth air supply and equalization duct 205, and the fourth perforated plate 113 are sequentially and fixedly connected, and the fourth perforated plate 113 is fixedly installed at the second air outlet.

[0056] The perforated plates at the same connection node positions of the main air distribution mechanism and the supplementary air distribution mechanism can be shared or set as different perforated plates. However, for ease of installation and connection, it is preferred to share a single whole perforated plate.

[0057] This invention includes a multi-level wind-uniform structure formed by multiple wind-uniform ducts and perforated plates, which increases the uniformity of wind speed in the vertical wind direction.

[0058] It should be noted that the main air duct 10 and the supplementary air duct 20 can also be designed as a single air duct, with internal partitions separating the sections.

[0059] The main air duct 10 also includes a main air duct return air duct 109, multiple lower return air ducts 106 and 107, and a lower return air variable diameter inlet 108. The main air duct return air duct 109, the lower return air variable diameter inlet 108, the multiple lower return air ducts 107, and the first air intake are sequentially and sealed and fixedly connected. The upper air duct 30 also includes an upper return air duct 209, multiple upper return air ducts, and an upper return air variable diameter inlet. The upper return air duct, the upper return air variable diameter inlet, the multiple upper return air ducts, and the second air intake are initially and sealed and fixedly connected.

[0060] This utility model also provides a method for adjusting the airflow of a wind field structure printed in ultra-large format as described above, including the following steps:

[0061] S1. Set the wind speed of the upper air duct 30, the main air duct 10 and the supplementary air duct 20 respectively;

[0062] S2. When printing starts, the downdraft fan and the updraft fan are started. The updraft fan and the downdraft fan are respectively controlled by PID according to the set wind speed. At the same time, the shut-off valve located in the make-up air duct 20 is adjusted so that the main air duct 10, the updraft duct 30 and the make-up air duct 20 all reach a stable wind speed set value.

[0063] S3. The downdraft anemometer and the updraft anemometer detect the airflow of the main duct 10 and the updraft 30 respectively, and feed the detection results back to the controller. The controller controls the updraft fan and the downdraft fan to perform PID control so that the main duct 10, the updraft 30 and the make-up air duct 20 always maintain a stable wind speed set value.

[0064] This utility model employs an independent control system for multiple fans. The upper duct fan provides the air volume required for the thin upper duct and forms a closed-loop circulation loop by combining the wind speed monitoring of the upper duct anemometer. The lower duct fan provides the air volume required for the lower main duct 10 and the thin upper supplementary air duct 20 and forms a closed-loop circulation loop by combining the wind speed monitoring of the lower duct anemometer. This achieves wind speed control for each duct, reduces wind speed fluctuations, and also reduces equipment noise.

[0065] This invention reduces the attenuation of wind speed along the wind direction by adjusting the structure of the three-inlet, double-outlet air duct system, which includes a main air duct 10, a supplementary air duct 20, and an upper air duct 30, with both ends of the main air duct 10, the supplementary air duct 20, and the upper air duct 30 connected to the air inlets and air outlets on both sides of the working chamber, respectively. This also reduces the air volume requirement of the equipment. The air volume can be reduced by 30% to 100%, where the denominator is our designed air volume.

[0066] For example, for equipment of the same specifications, the existing design air volume is 5000m³ / h. 3 / h, the wind farm structure design provided by this utility model is only 2600m 3 / h. Figure 4 The simulation analysis cloud map is obtained by using the wind field structure of this utility model. As can be seen from the figure, the wind field structure provided by this utility model has an attenuation of only 0.5 m / s along the wind speed direction, which is significantly reduced compared with the wind speed attenuation at the same height position in the prior art.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wind field structure for ultra-large format printing, characterized in that, A first air outlet, a second air outlet, and a third air outlet are provided on one side of the molding cavity, and a first air intake and a second air intake are provided on the other side. The first and second air outlets are located at the bottom of one side of the molding cavity, the second air outlet is located above and close to the first air outlet, and the third air outlet is located at the top of one side of the molding cavity. The first air intake is opposite to the first air outlet, and the second air intake is opposite to the third air outlet. The airflow structure further includes: The main air duct has one end connected to the first air outlet of the molding cavity and the other end connected to the first air inlet, and is used to blow air into the bottom of the molding cavity through the first air outlet; The air supply duct has one end connected to the second air outlet of the molding cavity, and the other end returns air through the first air intake. The air supply duct is used to supply air into the molding cavity through the second air outlet. An upper air duct, one end of which is connected to the third air outlet of the molding cavity and the other end of which is connected to the second air inlet, is used to blow air into the top of the molding cavity.

2. The wind field structure for ultra-large format printing according to claim 1, characterized in that, It also includes a downdraft fan, an updraft fan, a downdraft anemometer, and an updraft anemometer. The downdraft fan and downdraft anemometer are installed on the main air duct, and the updraft fan and updraft anemometer are installed on the updraft duct.

3. The wind field structure for ultra-large format printing according to claim 2, characterized in that, One end of the make-up air duct is connected to the main air duct and indirectly connected to the first air intake through the main air duct, and the other end is connected to the second air outlet. The downdraft fan and downdraft anemometer are located upstream of the make-up air duct.

4. The wind field structure for ultra-large format printing according to claim 1, characterized in that, It also includes a shut-off valve, which is installed on the make-up air duct and is used to adjust the air speed of the make-up air duct.

5. The wind field structure for ultra-large format printing according to claim 1, characterized in that, Place The widths of the first, second, and third air outlets are basically the same, and the heights of the second and third air outlets are less than that of the first air outlet.

6. The wind field structure for ultra-large format printing according to claim 1, characterized in that, The height of the second air outlet is half the height of the first air outlet, and the height of the third air outlet is 50% to 100% of the height of the first air outlet.

7. The wind field structure for ultra-large format printing according to claim 1, characterized in that, The main air duct includes a main air duct inlet pipe and a multi-stage main air distribution mechanism. The main air duct inlet pipe is connected to the first air outlet through the multi-stage main air distribution mechanism. The supplementary air duct includes a supplementary air duct inlet pipe and a multi-stage supplementary air distribution mechanism. The supplementary air duct inlet pipe is connected to the second air outlet through the multi-stage supplementary air distribution mechanism. The upper air duct inlet pipe is connected to the third air outlet through a multi-stage upper air distribution mechanism. Each stage of the main air distribution mechanism, supplementary air distribution mechanism, and upper air distribution mechanism includes at least one air distribution duct and a perforated plate. Multiple air distribution ducts and perforated plates are sequentially and alternately connected to form multiple stages.

8. The wind field structure for ultra-large format printing according to claim 1, characterized in that, The main air duct also includes a main air duct return air duct, multiple lower return air ducts, and a lower return air variable diameter port. The main air duct return air duct, the lower return air variable diameter port, the multiple lower return air ducts, and the first air intake are sequentially and sealed and fixedly connected. The upper air duct also includes an upper air duct return air duct, multiple upper return air ducts, and an upper return air variable diameter port. The upper air duct return air duct, the upper return air variable diameter port, the multiple upper return air ducts, and the second air intake are sequentially and sealed and fixedly connected.

9. The wind field structure for ultra-large format printing according to claim 1, characterized in that, The first air outlet and the second air outlet are separated by a partition.

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